(57) An X-Y signal generating device comprises two bands (11,11′) extending between and
around two pairs of rollers (12,13) and (12′,13′). One band moves in the X-direction
and one in the Y-direction, and one band is located inside the other. The rollers
are mounted on a common block (14). Each band has a strengthened section (17, 17′)
with a slot (18,18′) in it. An acutating key (21) is located at the crossover point
of the two slots and may be moved freely in any direction, within limits, causing
proportionate movement of the two bands around the rollers. XY control signals can
be derived independently from the movement of the bands. The XY control signals can
be produced by providing the bands with combined resistive/conductive surfaces and
using conductive rollers to pass a current through the bands.
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